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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32767 results found.

  1. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  2. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  3. GRB 100331A: BOOTES-3 observations
  4. Konus-Wind observation of GRB 100324B
  5. GRB 100331A: A long GRB detected by INTEGRAL
  6. IPN triangulation of GRB100324B
  7. Konus-Wind observation of GRB 100322A
  8. Short X-ray Transient detected by MAXI/GSC
  9. GRB 100322A: Suzaku WAM observation of the prompt emission
  10. GROND observations of GRB100316D/SN2010bh
  11. GRB 100324A: GROND observations
  12. Emerging Supernova in the Afterglow of GRB 100316D
  13. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  14. SGR 1833-0832: Swift/UVOT Upper Limits
  15. SGR 1833-0832: Archival Chandra Observations
  16. SGR 1833-0832 is pulsed at 7.56 seconds
  17. SGR 1833-0832 is pulsed at 7.56 seconds
  18. Possible pulsation period in SGR 1833-0832
  19. Discovery of the Spin Period of SGR 1833-0832
  20. GRB 100316D: ATCA radio observations
  21. GRB 100319A: correction to GCN 10527
  22. Probable SGR 1833-0832: Swift-XRT refined analysis
  23. Swift-XRT refined position of the probable new SGR 1833-0832
  24. Swift-BAT refined analysis of the probable new SGR 1833-0832
  25. GRB 100219A: MASTER-Net optical alert observations
  26. GRB 100316D: Possible Supernova
  27. GRB 100316D: Pre-burst emission measured by BAT
  28. GRB 100316D: Further Gemini observations
  29. GRB 100219A: optical upper limit
  30. GRB 100316A: optical observations in CrAO
  31. GRB 100316D: Swift/UVOT Observations
  32. GRB 100316D: Swift XRT enhanced position and further refined analysis
  33. GRB 100316B: Swift-XRT refined analysis
  34. Tentative redshift of GRB100316D from X-ray data
  35. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  36. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  37. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  38. GRB 100316D: VLT/X-shooter observations
  39. GRB 100316D: Swift-BAT refined analysis
  40. GRB100316C: Swift/UVOT Upper Limits
  41. GRB 100316C: Swift-BAT refined analysis
  42. GRB 100316B: Swift/UVOT observations
  43. GRB 100316C: Swift-XRT team refined analysis
  44. GRB 100316D: Swift XRT refined analysis
  45. GRB 100316A: TAROT Calern observatory optical observations
  46. GRB 100316A: Swift-XRT refined analysis
  47. GRB 100316A: Swift-BAT refined analysis
  48. GRB 100316B: Swift-BAT refined analysis
  49. GRB100316A: Swift/UVOT Upper Limits
  50. GRB 100316C: BOOTES-3 observations
  51. GRB 100316B: VLT/X-shooter redshift
  52. GRB 100316B: Skynet/PROMPT Observations of Fading
  53. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  54. GRB 100316 optical candidate from 1.23m CAHA telescope
  55. GRB 100316 optical candidate from 1.23m CAHA telescope
  56. GRB 100316A: Swift/UVOT Observations
  57. GRB 100305A: Super-LOTIS early observations
  58. GRB100302A : LOAO observations and Lulin afterglow analysis
  59. GRB 100305A, Swift-BAT refined analysis
  60. GRB 100305A: Gemini z'-band observation
  61. GRB 100305A: Swift/UVOT Upper Limits
  62. GRB 100305A: Swift-XRT refined analysis
  63. GRB 100305A Optical Observations
  64. GRB 100305A: Gemini-N OT candidate
  65. GRB 100305A: PAIRITEL NIR Upper Limits
  66. GRB 100305A: P60 Observations
  67. GRB 100302A: Ondrejov 65cm limit
  68. GRB 100302A: Swift/UVOT Upper Limits
  69. GRB 100302A: Swift-XRT refined analysis
  70. GRB 100302A: Gemini-North redshift
  71. GRB 100302A: Gemini-N OT confirmation
  72. GRB 100302A: Optical observations at Crni Vrh
  73. GRB 100302A: MASTER-Net optical alert observations
  74. GRB 100302A, Swift-BAT refined analysis
  75. GRB 1000302A : A possible afterglow candidate
  76. GRB 100302A: Skynet/DAO Observations
  77. GRB 100224B: Fermi GBM detection
  78. GRB 100206A: optical observations in CrAO
  79. GRB 100206A: optical observations in Terskol
  80. GRB 100213B: Mondy optical observations
  81. GRB 100219A: optical observations
  82. GRB 100219A: GAO 150cm telescope Optical Observation
  83. Swift Triggers 413744 and 413745 are not GRBs
  84. GRB
  85. GRB 100219A: X-shooter refined analysis
  86. GRB 100219A: XRT refined analysis
  87. GRB 100219A - Gemini South Spectroscopy
  88. GRB 100216A: Swift/UVOT Observations
  89. GRB 100219A: VLT/X-shooter redshift
  90. GRB100219A Akeno and Okayama MITSuME Optical Observation
  91. GRB 100219A: GROND observations
  92. GRB 100219A: NOT OA observations
  93. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  94. GRB 100216A: XRT Refined Analysis
  95. GRB 100219A: Swift-BAT refined analysis
  96. GRB 100219A: Pre-explosion imaging and host candidate
  97. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  98. GRB 100216A: Keck imaging
  99. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  100. GRB 100213B: GRT Optical Observation

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